Accomodate for ASANs detect_stack_use_after_return=1 when computing scope marker for safepointing

R=ager@chromium.org
BUG=339813

Review URL: https://codereview.chromium.org/147743003

git-svn-id: svn://svn.chromium.org/blink/trunk@166240 bbb929c8-8fbe-4397-9dbb-9b2b20218538